"TaylorMade is a very viable business. However, we decided that now is the time to focus even more on our core strength in the athletic footwear and apparel market," CEO Herbert Hainer in a release at the time.

As noted by ESPN sports-business writer Darren Rovell on Twitter, Adidas' new strategy is just another sign of difficulties in the golf-equipment business, as retailers ditch clubs and balls in favor of shoes and shirts.

Rory McIlroy, decked out in Nike gear.
David J. Phillip/AP

In August, Nike announced it would transition out of selling golf clubs, balls, and bags, while continuing to sell golf footwear and apparel. And, as Under Armour has moved into the golf business, it has stayed clear of clubs, focusing exclusively on apparel and shoes.

The golf industry has struggled to attract younger players in recent years.

"From the golf-industry statistics, we know that rounds are down. We know that millennials are not picking up the game, and boomers are aging out. The game is in decline," Matt Powell of industry-research firm NPD explained in a video in July.

With most golf-equipment sales stemming from older, long-time golfers, it make sense for companies to focus on apparel, not clubs, balls, and bags that don't wear out quickly. Established golfers tend to have loyalties to bag brands, and are unlikely to be won over by newer companies relying on trendy marketing and super-star names.

Meanwhile, an Adidas, Nike, or Under Armour shirt or hat is unlikely to be seen as a make-or-break part of a golfer's game. Plus, even if golf is failing to attract new players buying their first sets of clubs, even veteran golfers need to buy new shoes at some point.